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Another quality solar thermal design from feklar

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Posted by feklar on October 21, 2003, 6:40 pm
 
A supercharged heated air turbine.

North side: parabolic solar trough reflector.

South side: clear structural glass enclosure, either at ground level
or elevated on cast structural glass pylons.

Let's use a 40 foot long section for example purposes.  Also for the
enclosure internal dimensions lets use, say, 2 feet high and 10 inches
wide (N/S), by 40 feet long (E/W).  Open to the air at the top @ 10
inches by 40 feet.  Maybe with a little roof a few inches over the top
of the opening to keep the rain out.

Inside the enclosure, install a pipe and bearings, say 9 bearings for
approximately (a little less than) 5 foot sections of pipe between
bearings.

For the pipe, use, say, an 8 inch diameter.  Made of clear structural
glass, but with the inner surface coated with heat storage mass
material.  Or instead, have a rod of heat storage material affixed
inside the center of the pipe, running the length of the pipe.

Given this setup, there will be approx. five feet of pipe between each
bearing.  The bearings are there because the pipe will rotate inside
the bearings.

When making the pipe, slot it.  Cut slots in it so air can pass out of
the pipe, and arrange the slots so they run in the direction of the
length of the pipe, between the bearings.  Orient or angle the slots
so that if heated air escapes out of them at high velocity, the pipe
will rotate, and the pipe will only be able to rotate in one
direction.

Now take the approximately 20,000 solar watts you will get with about
a 7 foot wide 40 foot long reflector trough, and focus it upon the
heat storage mass material coating on the inner diameter of the pipe
(or upon the inner rod if using a rod).

Cool air will be sucked into the ends of the pipe as the heat storage
mass material heats up and the air will be heated and escape out of
the slots to the airspace within the enclosure.  As the mass
constinues to rise in temperature, the air flow because of the
pressure increase of the heated air will increase and the pipe will
begin rotating from the turbine arrangemnt of the slots and the force
of the escaping heated air.

It is hihgly likely that an impressive rotational speed can be
achieved this way.  The bearings could be magnetically levitated, but
I would think the method itself lends itself more to air pressure
levitation using the same principle.  Have small sections of the
reflector trough focus their energy on small heat storage masses with
a venturi for an air supply inlet, and use small air holes in each
bearing surface for the heated air to escape, like an air hockey
table.

The top of the enclosure is open to the air, and here the heated air
escapes.  At the top of the enclosure, install a "supercharger"  Or in
other words, a roller cage blower type fan running the length of the
enclosure.  Link the rotating pipe mechanically with the fan drive,
probably as simple as using a v-belt at each end of the enclosure.  As
the fan rotates, the hot air is helped to be forced out of the
enclosure.  This should either guarantee the correct direction of
airflow (out the top of the enclosure), or amplify it once it is
established since it will improve the pressure / temperature gradient
between the heated air and the replacement cool air.  It will evacuate
the waste heat from the exhaust area.

Next to each bearing, or every other bearing, or at just the two end
bearings, install a magnetic stator onto the pipe and affix it into
place so it rotates with the pipe.  Then have sliding generator
windings that can slide past the bearing to control the rotational
speed.  The higher the speed, the more of the windings are slid over
the areas where the stators are rotating, and the more power is
produced, and the more mechanical braking action on the pipe as a
result.

This might be an excellent choice to use in conjuction with structural
glass biomass production greenhouses, since these greenhouses do not
require 100 percent of the incident solar energy.  In this case,
install the setup on the roof of the greenhouses.  Instead of a single
large trough, use three panel reflector troughs with a foot or half
foot or so if empty space between each trough, and instead of
orienting striaght east and west, be off by ten or fifteen degrees.
This will ensure adequate insolation inside the greenhouse, at the
cost of a slight loss in power production efficiency.

At the ends of the pipe where cooler air is being sucked in, it may
also be possible to install a wind generator at each end to further
brake the rotation and provide more power output.

The only specific potential problem issue here that I can see that
needs further addressing is the bearing issue.  Obviously, prolonging
the lifespan of the bearings is of considerable importance.

Posted by feklar (was feklar@rock.com on October 21, 2003, 6:45 pm
 
On 21 Oct 2003 11:40:19 -0700, feklar@rock.com (feklar) wrote:


This one may have to be kick-started in the morning to get it running.
A lot of initial resistance at first...

ptaakhangsat@sbcglobal.net
subtract where I hang at to unmunge

The Amazing and Mysterious Powers of Mexican Females.

Chapter 1: Levitation and Summoning.
http://www.angelfire.com/empire2/ptaak/images/mexwench.jpg

Posted by feklar (was feklar@rock.com on October 21, 2003, 7:00 pm
 On 21 Oct 2003 11:40:19 -0700, feklar@rock.com (feklar) wrote:


This applies if you want to get maximum land use efficiency.  The
angle of 10 or 15 degrees affects the insolation of the greenhouse
just to the north of the trough.

For maximum land use you want to pack the setups together east and
west and north and osuth, so from sourth to north you would have
greenhouse, trough,greenhouse, trough,greenhouse, trough,greenhouse,
trough, etc...  with as little space as possible between each pair.

For large scale biomass / solar terraforming, in other words.

should have read

For a backyard effort, obviously this probably isn't an issue.

ptaakhangsat@sbcglobal.net
subtract where I hang at to unmunge

The Amazing and Mysterious Powers of Mexican Females.

Chapter 1: Levitation and Summoning.
http://www.angelfire.com/empire2/ptaak/images/mexwench.jpg

Posted by feklar (was feklar@rock.com on October 22, 2003, 7:14 pm
 On 21 Oct 2003 11:40:19 -0700, feklar@rock.com (feklar) wrote:


For the time being, just assume that I know a way to make everything
out of structural glass for a ridiculously low cost.  The troughs, the
supports, the pipe, the exhaust blower, even the bearings.  Everything
except the iron ferrite and steel stator cores, and the copper
windings of the armatures.

So don't discard it out of hand because it would cost too much or
"more appropriate" materials would be available that would also make
it cost too much for what the output and efficiency might be.

Deal instead with the principle.

ptaakhangsat@sbcglobal.net
subtract where I hang at to unmunge

The Amazing and Mysterious Powers of Mexican Females.

Chapter 1: Levitation and Summoning.
http://www.angelfire.com/empire2/ptaak/images/mexwench.jpg

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